Highly porous carbon nanotube/polysulfone nanocomposite supports for high-flux polyamide reverse osmosis membranes
Highly porous carbon nanotube/polysulfone nanocomposite supports for high-flux polyamide reverse osmosis membranes
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DOI：
10.1016/j.memsci.2017.06.027
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发表时间：
2017-10
影响因子：
9.5
通讯作者：
T. Lee;Min Yong Lee;Hee Dae Lee;Ji Soo Roh;Hyo Won Kim;H. Park
中科院分区：
文献类型：
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作者：
T. Lee;Min Yong Lee;Hee Dae Lee;Ji Soo Roh;Hyo Won Kim;H. Park
最近的研究强调，薄膜复合（TFC）膜中支撑层的表面性质对反渗透（RO）性能起着重要作用。在这项研究中，我们使用碳纳米管（CNTs）来调整微孔聚砜膜的表面性能。所制备的CNT/PSf纳米复合材料载体显示出显着改善的表面孔隙率，同时保持表面孔半径和疏水性。这样的表面特性导致在无缺陷的形成的聚酰胺（PA）选择性层具有大的表面积，这导致增强的PA-TFC膜的通量。与裸PA-TFC膜相比，用CNT/PSf纳米复合材料支撑体制备的PA-TFC膜显示出高达35%的水渗透率的改善而不损失盐截留率。结果表明，支撑体的表面孔隙率是影响TFC膜透水性的主要因素，而支撑体内部的纯水通量和PA层的厚度对TFC膜的透水性影响不大。我们还提出了一个方向，通过比较研究碳纳米管和亲水性成孔剂作为添加剂在支持材料中产生最佳的支持。
Recent studies have emphasized that the surface properties of support layers in thin-film composite (TFC) membranes play a significant role in reverse osmosis (RO) performance. In this study, we used carbon nanotubes (CNTs) to tune the surface properties of microporous polysulfone membranes. The prepared CNT/PSf nanocomposite supports showed significantly improved surface porosity while maintaining both surface pore radius and hydrophobicity. Such surface characteristics resulted in the defect-free formation of a polyamide (PA) selective layer possessing a large surface area, which led to enhancement in the flux of PA-TFC membranes. PA-TFC membranes prepared with CNT/PSf nanocomposite supports showed improved water permeance up to 35% without losing salt rejection compared to the bare PA-TFC membranes. The results revealed that the surface porosity of the support is a dominant factor influencing the water permeance of TFC membranes rather than the pure water flux inside the support itself or the thickness of the PA layer. We also propose a direction for generating optimal supports through a comparison study between CNTs and hydrophilic pore formers as additives in the support material.